312101310312221 has 4 divisors (see below), whose sum is σ = 312163618424700. Its totient is φ = 312039002199744.

The previous prime is 312101310312199. The next prime is 312101310312257. The reversal of 312101310312221 is 122213013101213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70239250144996 + 241862060167225 = 8380886^2 + 15551915^2 .

It is a cyclic number.

It is not a de Polignac number, because 312101310312221 - 2⁶ = 312101310312157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312101310312521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31154048726 + ... + 31154058743.

It is an arithmetic number, because the mean of its divisors is an integer number (78040904606175).

Almost surely, 2^{312101310312221} is an apocalyptic number.

It is an amenable number.

312101310312221 is a deficient number, since it is larger than the sum of its proper divisors (62308112479).

312101310312221 is an equidigital number, since it uses as much as digits as its factorization.

312101310312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62308112478.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 312101310312221 its reverse (122213013101213), we get a palindrome (434314323413434).

The spelling of 312101310312221 in words is "three hundred twelve trillion, one hundred one billion, three hundred ten million, three hundred twelve thousand, two hundred twenty-one".